This International Standard defines terminology relating to fire, principally fire tests. Each entry in this International Standard is structured as follows: a) the term(s) for the concept under consideration, together with an indication of the part of speech, if not evident, and an indication of the unit to be used in cases where the term describes a physical quantity; b) the definition of the concept. The terms are presented in English alphabetical order. Where more than one term is given for a concept, synonyms appear in alphabetical order in the index at the end. NOTE In addition to terms and definitions used in two of the three official ISO languages (English and French), this International Standard gives the equivalent terms and definitions in German; these are published under the responsibility of the member body for Germany (DIN). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.